Appearing in a pre-taped interview on "Good Morning America" on August 14, Sylvester Stallone, 66, spoke for the first time about his son Sage's death. The action star's filmmaker and actor son, 36, was found dead in his California home July 13.

"It's tough. It's very very tough," Sylvester said while promoting "The Expendables 2." "It's a horrible situation, but time, hopefully, will heal and you try to get through it. It's something that's a reality in life."

Sage, who made his movie debut alongside his father in "Rocky V," was one of two sons from Sylvester's first marriage to Sasha Czack. He was laid to rest on July 21 at St. Martin of Tours Catholic Church in the upscale Brentwood area of Los Angeles. The cause of Sage's death is not yet known.

On August 13, Sylvester and his family -- including wife Jennifer Flavin, 44, and daughters Sophia, 15, Sistine, 14, and Scarlet, 10 -- attended the London premiere of "The Expendables 2." Sylvester's son Seargeoh, 33, was not present.